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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (06-01-12). Data set reviewer(s): Schubert K. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera atraphaxidis Schmied.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Trichocladia atraphaxidis Golovin. Type: Trichocladia atraphaxidis Golovin.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [300] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China (+ Central Asia) and Mongolia. Country or state(s): Kazakhstan, Kyrgyzstan, Tajikistan, and Mongolia (Mongolia).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Atraphaxis pungens (M. Bieb) Jaub. & Spach; Atraphaxis, Polygonaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .09-.18-(.23) mm in diam.. Margin: External filaments present (usually turning towards one direction); setiform, recurved (tips not or only slightly recurved) or straight, 2-6-(8) µm long, 7.5-12-(15) µm in diameter, hyaline, few, (6)-10-12 per mm², growing more or less between the lower and upper hald of the ascocarp, smooth, thin or moderatly thick (towards the base), not ramified (often) or ramified, dichotomously branched (1-3 times, branchings loose, lax, tips not or only slightly recurved), aseptate or septate (a single septum at the base).

Asci: 5-22 asci per ascocarp, indistinctly stipitate, 50-90 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-4-(6) per ascus, subglobose, ellipsoid, or ovoid, (14)-18-30 µm long, 9-20 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 35-50 µm long, 11-18 µm wide; aseptate.

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